/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.atlas.lib;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.fail;

import java.nio.ByteBuffer;

import org.junit.jupiter.api.Test;

public class TestBytes
{
    @Test public void intToBytes1() {
        byte[] b = Bytes.intToBytes(0xF1020304);
        assertEquals(Integer.BYTES, b.length);
        assertEquals(0xF1, b[0]&0xFF);
        assertEquals(0x02, b[1]);
        assertEquals(0x03, b[2]);
        assertEquals(0x04, b[3]);
    }

    @Test public void longToBytes1() {
        byte[] b = Bytes.longToBytes(0xF506070801020304L);
        assertEquals(Long.BYTES, b.length);
        assertEquals(0xF5, b[0]&0xFF);
        assertEquals(0x06, b[1]);
        assertEquals(0x07, b[2]);
        assertEquals(0x08, b[3]);
        assertEquals(0x01, b[4]);
        assertEquals(0x02, b[5]);
        assertEquals(0x03, b[6]);
        assertEquals(0x04, b[7]);
    }

    @Test public void packInt1() {
        byte[] b = new byte[4];
        Bytes.setInt(0x01020304,b);
        assertEquals(0x01, b[0]);
        assertEquals(0x02, b[1]);
        assertEquals(0x03, b[2]);
        assertEquals(0x04, b[3]);
    }

    @Test public void packInt2() {
        byte[] b = new byte[8];
        Bytes.setInt(0x01020304,b,0);
        Bytes.setInt(0x05060708,b,4);
        assertEquals(0x01, b[0]);
        assertEquals(0x02, b[1]);
        assertEquals(0x03, b[2]);
        assertEquals(0x04, b[3]);
        assertEquals(0x05, b[4]);
        assertEquals(0x06, b[5]);
        assertEquals(0x07, b[6]);
        assertEquals(0x08, b[7]);
    }

    @Test public void packInt3() {
        byte[] b = new byte[4];
        Bytes.setInt(0xF1F2F3F4,b);
        int i = Bytes.getInt(b);
        assertEquals(0xF1F2F3F4, i);
    }

    @Test public void packInt4() {
        byte[] b = new byte[8];
        Bytes.setInt(0x01020304,b,0);
        Bytes.setInt(0x05060708,b,4);

        int i1 = Bytes.getInt(b,0);
        int i2 = Bytes.getInt(b,4);
        assertEquals(0x01020304, i1);
        assertEquals(0x05060708, i2);
    }

    @Test public void packLong5() {
        byte[] b = new byte[8];
        Bytes.setLong(0x0102030405060708L,b);
        assertEquals(0x01, b[0]);
        assertEquals(0x02, b[1]);
        assertEquals(0x03, b[2]);
        assertEquals(0x04, b[3]);
        assertEquals(0x05, b[4]);
        assertEquals(0x06, b[5]);
        assertEquals(0x07, b[6]);
        assertEquals(0x08, b[7]);
   }

    @Test public void packLong6() {
        byte[] b = new byte[16];
        Bytes.setLong(0x0102030405060708L,b,0);
        Bytes.setLong(0x1112131415161718L,b,8);
        assertEquals(0x01, b[0]);
        assertEquals(0x02, b[1]);
        assertEquals(0x03, b[2]);
        assertEquals(0x04, b[3]);
        assertEquals(0x05, b[4]);
        assertEquals(0x06, b[5]);
        assertEquals(0x07, b[6]);
        assertEquals(0x08, b[7]);

        assertEquals(0x11, b[0+8]);
        assertEquals(0x12, b[1+8]);
        assertEquals(0x13, b[2+8]);
        assertEquals(0x14, b[3+8]);
        assertEquals(0x15, b[4+8]);
        assertEquals(0x16, b[5+8]);
        assertEquals(0x17, b[6+8]);
        assertEquals(0x18, b[7+8]);
    }

    @Test public void packLong7() {
        byte[] b = new byte[8];
        Bytes.setLong(0xF1F2F3F4F5F6F7F8L,b);
        long i = Bytes.getLong(b);
        assertEquals (0xF1F2F3F4F5F6F7F8L,i);
    }

    @Test public void packLong8() {
        byte[] b = new byte[16];
        Bytes.setLong(0xF1F2F3F4F5F6F7F8L,b,0);
        Bytes.setLong(0xA1A2A3A4A5A6A7A8L,b,8);

        long i1 = Bytes.getLong(b,0);
        long i2 = Bytes.getLong(b,8);
        assertEquals(0xF1F2F3F4F5F6F7F8L,i1);
        assertEquals(0xA1A2A3A4A5A6A7A8L,i2);
    }

    @Test public void compare1()    { compare(0, new byte[]{}, new byte[]{}); }
    @Test public void compare2()    { compare(+1, new byte[]{1}, new byte[]{}); }
    @Test public void compare3()    { compare(-1, new byte[]{1}, new byte[]{1,2}); }

    @Test public void compare4()    { compare(+1, new byte[]{1,3}, new byte[]{1,2}); }
    @Test public void compare5()    { compare(+1, new byte[]{1,3}, new byte[]{1,2,3}); }
    @Test public void compare6()    { compare(-1, new byte[]{1,2}, new byte[]{1,2,3}); }

    byte[] bytes = { 1, 2, 3, 4, 5, 6 };

    @Test public void slice1()
    {
        byte[] x = Bytes.copyOf(bytes);
        assertArrayEquals(bytes, x);
    }

    @Test public void slice3()
    {
        byte[] x = Bytes.copyOf(bytes,3);
        byte[] y = new byte[]{4,5,6};
        assertArrayEquals(y, x);
    }

    @Test public void slice2()
    {
        byte[] x = Bytes.copyOf(bytes,3,2);
        byte[] y = new byte[]{4,5};
        assertArrayEquals(y, x);
    }

    private static void compare(int expected, byte[] b1, byte[] b2) {
        int x = Bytes.compare(b1, b2);
        if ( x > 0 && expected > 0 ) return;
        if ( x == 0 && expected == 0 ) return;
        if ( x < 0 && expected < 0 ) return;
        fail("Does not compare: "+Bytes.asHex(b1)+" :: "+Bytes.asHex(b2));
    }

    private static void codec(String str) {
        ByteBuffer bb = ByteBuffer.allocate(16);
        Bytes.toByteBuffer(str, bb);
        bb.flip();
        String str2 = Bytes.fromByteBuffer(bb);
        assertEquals(str, str2);
    }

    static private final String asciiBase             = "abc";
    static private final String latinBase             = "Àéíÿ";
    static private final String latinExtraBase        = "ỹﬁﬂ";  // fi-ligature, fl-ligature
    static private final String greekBase             = "αβγ";
    static private final String hewbrewBase           = "אבג";
    static private final String arabicBase            = "ءآأ";
    static private final String symbolsBase           = "☺☻♪♫";
    static private final String chineseBase           = "孫子兵法"; // The Art of War
    static private final String japaneseBase          = "日本";    // Japanese

    @Test public void codec1()  { codec(asciiBase); }
    @Test public void codec2()  { codec(""); }
    @Test public void codec3()  { codec(greekBase); }
    @Test public void codec4()  { codec(hewbrewBase); }
    @Test public void codec5()  { codec(arabicBase); }
    @Test public void codec6()  { codec(symbolsBase); }
    @Test public void codec7()  { codec(chineseBase); }
    @Test public void codec8()  { codec(japaneseBase); }
}
